Data Integrity and Constraints: Master Data Accuracy in Database Management Systems

Question 1

Which of the following is **not** a widely used data validation technique to ensure data integrity in database management systems?

Accepted Answer

Checksum Verification

Answer

Data Types

Answer

Range Checking

Question 2

In database management, what's the main purpose of data constraints?

Accepted Answer

Ensure data accuracy by enforcing validity and preventing inconsistencies.

Answer

Boost database speed and save storage space.

Answer

Allow users to bypass security and access unauthorized data.

Answer

Organize data without affecting its integrity.

Question 3

What type of constraint establishes a connection between two tables based on matching values in designated columns?

Accepted Answer

Foreign key constraint

Answer

Primary key constraint

Answer

Unique key constraint

Answer

Check constraint

Question 4

Which constraint limits the permissible values that can be entered into a specific column?

Accepted Answer

Check constraint

Answer

Primary key constraint

Answer

Foreign key constraint

Answer

Unique key constraint

Question 5

What is the primary objective of implementing data integrity rules?

Accepted Answer

Ensuring data accuracy and reliability

Answer

Enhancing database speed

Answer

Preventing unauthorized data access

Answer

Simplifying data retrieval

Question 6

Which of the following is not considered an advantage of utilizing data integrity constraints?

Accepted Answer

Increased database complexity

Answer

Minimized data entry errors

Answer

Improved data consistency

Answer

Enhanced data security

Question 7

What is the purpose of a cascading delete rule?

Accepted Answer

To delete related rows automatically when a parent row is deleted

Answer

To prevent deletion of rows with related rows

Answer

To update related rows when a parent row is updated

Answer

To insert related rows when a parent row is inserted

Question 8

Which of the following is not a type of data integrity constraint?

Accepted Answer

Data type constraint

Answer

Primary key constraint

Answer

Foreign key constraint

Answer

Unique key constraint

Question 9

Why is maintaining data integrity crucial in database systems?

Accepted Answer

To ensure accurate and reliable data

Answer

To enhance database performance

Answer

To safeguard data from unauthorized access

Answer

To facilitate easier data retrieval

Question 10

Which of these practices would harm data integrity in a database?

Accepted Answer

Disabling triggers and constraints

Answer

Enforcing data type constraints

Answer

Using data validation techniques

Question 11

Which data anomaly occurs when a table contains multiple identical records?

Accepted Answer

Duplicate anomaly

Answer

Insertion anomaly

Answer

Update anomaly

Answer

Deletion anomaly

Question 12

What is the primary purpose of using foreign key constraints with the ON DELETE CASCADE option?

Accepted Answer

To ensure that child records are not left without a parent record when the parent record is deleted.

Answer

To prevent deleting parent records if there are related child records.

Answer

To prevent deleting child records if the parent record is deleted.

Answer

To have no effect on the integrity of the data.

Question 13

In database management, what is the primary purpose of referential integrity?

Accepted Answer

Prevents orphaned records

Answer

Ensures unique data in a table

Answer

Enhances database speed

Question 14

In a business setting, which of the following is NOT an advantage of maintaining data integrity?

Accepted Answer

Increased data redundancy

Answer

Enhanced decision-making

Answer

Improved customer satisfaction

Answer

Reduced operational costs

Question 15

In evaluating data integrity measures for a database management system, which factor is most critical?

Accepted Answer

Potential severity of data integrity violations

Answer

Number of data integrity rules implemented

Answer

Cost of implementing data integrity measures

Answer

Ease of use for database users

Question 16

Which database constraint is specifically designed to prevent duplicate values within a column?

Accepted Answer

UNIQUE

Answer

CHECK

Answer

NOT NULL

Answer

FOREIGN KEY

Question 17

Which type of constraint establishes a relationship between two tables, where the primary key of one table becomes the foreign key in the other?

Accepted Answer

FOREIGN KEY

Answer

PRIMARY KEY

Answer

UNIQUE

Question 18

Which constraint allows you to specify a condition that must be met by the data entered into a column?

Accepted Answer

CHECK

Answer

PRIMARY KEY

Answer

UNIQUE

Answer

FOREIGN KEY

Question 19

Which of the following is considered a data type, rather than a data constraint?

Accepted Answer

Date

Answer

Foreign key

Answer

Check constraint

Answer

Primary key

Question 20

What is the primary objective of a referential integrity constraint?

Accepted Answer

To maintain data consistency by ensuring that related data exists in both tables.

Answer

To validate data entered into a column.

Answer

To prevent duplicate values in a table.

Question 21

Which of the following is NOT considered an advantage of utilizing data constraints in database design?

Accepted Answer

Increased data redundancy

Answer

Improved performance

Answer

Enhanced data accuracy

Answer

Enforced business rules

Question 22

Consider a business rule that requires a customer's age to be at least 18 years old. Which type of constraint can be used to enforce this rule?

Accepted Answer

CHECK (age >= 18)

Answer

FOREIGN KEY (age) REFERENCES customers(age)

Answer

PRIMARY KEY (age)

Answer

UNIQUE (age)

Question 23

What is the fundamental difference between a primary key and a foreign key?

Accepted Answer

A primary key uniquely identifies rows within a table, while a foreign key references the primary key of another table.

Answer

A primary key is used for data validation, while a foreign key establishes relationships.

Question 24

Which practice is considered essential for maintaining data integrity in a relational database?

Accepted Answer

Enforcing business rules through the use of data constraints.

Answer

Manually checking data for errors before entering it into the database.

Answer

Neglecting to back up the database on a regular basis.

Answer

Allowing users to enter data in any format they desire.

Question 25

What is the primary purpose of a database schema?

Accepted Answer

To define the structure, constraints, and relationships within a database.

Answer

To store data in a structured format.

Answer

To provide a visual representation of a database.

Question 26

Which database constraint prevents a foreign key from referencing a non-existent value in the referenced table?

Accepted Answer

Referential integrity constraint

Answer

Primary key constraint

Answer

Check constraint

Answer

Unique constraint

Question 27

Which database constraint specifies a condition that must be met by the values entered into a column?

Accepted Answer

Check constraint

Answer

Primary key constraint

Answer

Unique constraint

Answer

Foreign key constraint

Question 28

Which database constraint ensures that a column always contains a value?

Accepted Answer

NOT NULL constraint

Answer

Primary key constraint

Answer

Foreign key constraint

Answer

Unique constraint

Question 29

Which database constraint prohibits duplicate values from being entered into a specific column or set of columns?

Accepted Answer

Unique constraint

Answer

Foreign key constraint

Answer

Check constraint

Answer

Primary key constraint

Question 30

Which of the following is NOT a type of data integrity constraint?

Accepted Answer

Performance constraint

Answer

Primary key constraint

Answer

Foreign key constraint

Question 31

What is the primary objective of enforcing data integrity in a database?

Accepted Answer

To maintain data accuracy, consistency, and validity

Answer

To reduce storage space

Answer

To simplify data retrieval

Answer

To enhance database performance

Question 32

Which of the following is a key advantage of utilizing constraints in a database?

Accepted Answer

Improved data quality and reliability

Answer

Faster data retrieval

Answer

Reduced storage space

Answer

Simplified data manipulation

Question 33

What key factors should be considered when selecting which integrity constraints to implement in a database?

Accepted Answer

Data requirements, application logic, and database performance

Answer

Database size

Answer

User interface design

Question 34

Which of the following is a recommended best practice for enforcing data integrity in a database?

Accepted Answer

Employing a combination of constraints

Answer

Solely relying on check constraints

Answer

Solely relying on primary key constraints

Answer

Solely relying on foreign key constraints

Question 35

Which of the following is NOT a type of data integrity constraint?

Accepted Answer

Default value

Answer

Unique constraint

Answer

Primary key

Answer

Foreign key

Question 36

What is the primary purpose of a primary key constraint?

Accepted Answer

To uniquely identify each row in a table.

Answer

To prevent duplicate data entry.

Answer

To enforce referential integrity.

Answer

To ensure data accuracy.

Question 37

What is the consequence of violating a foreign key constraint?

Accepted Answer

The database rejects the insert or update operation.

Answer

The primary key of the parent table is updated.

Answer

The foreign key column is set to null.

Answer

The data in the child table is automatically deleted.

Question 38

What is the intended purpose of a domain constraint?

Accepted Answer

To restrict the values that can be entered into a column.

Answer

To prevent data loss.

Answer

To ensure data consistency.

Question 39

Which of the following is a potential disadvantage of using constraints?

Accepted Answer

Increased database complexity.

Answer

Enhanced data security.

Answer

Reduced data redundancy.

Answer

Improved data accuracy.

Question 40

What is the fundamental distinction between a hard constraint and a soft constraint?

Accepted Answer

Hard constraints are strictly enforced by the database, while soft constraints can be violated.

Answer

Hard constraints are defined at the table level, while soft constraints are defined at the column level.

Answer

Hard constraints are enforced by the application, while soft constraints are enforced by the database.

Question 41

How do data integrity violations impact data quality?

Accepted Answer

Result in inaccurate and unreliable data.

Answer

Enhance data security.

Answer

Improve data performance.

Answer

Increase data redundancy.

Question 42

Which constraint ensures that a foreign key value in one table matches a primary key value in another table?

Accepted Answer

Referential integrity constraint

Answer

Unique constraint

Answer

Check constraint

Answer

Not null constraint

Question 43

A database table has a 'CustomerID' column with a unique constraint. What does this constraint guarantee?

Accepted Answer

Each 'CustomerID' value is unique and cannot be duplicated.

Answer

The 'CustomerID' column cannot be updated.

Answer

All customer ID values are entered in a specific format.

Answer

The 'CustomerID' column cannot contain null values.

Question 44

You want to ensure that the 'Salary' column in an 'Employee' table only accepts values greater than 0. Which constraint would you use?

Accepted Answer

Check constraint

Answer

Foreign key constraint

Answer

Primary key constraint

Answer

Not null constraint

Question 45

Which of the following is NOT a direct benefit of enforcing data integrity constraints in a database?

Accepted Answer

Increased database storage space requirements.

Answer

Enhanced data reliability and trustworthiness.

Answer

Reduced data redundancy.

Answer

Improved data accuracy and consistency.

Question 46

A database table has a 'ProductID' column designated as a primary key. What is the primary function of this constraint?

Accepted Answer

To uniquely identify each product record in the table.

Answer

To enforce a specific data type for the 'ProductID' column.

Answer

To prevent deletion of product records.

Answer

To ensure that all product names are entered correctly.

Question 47

Which constraint guarantees that a specific column in a table cannot contain null values?

Accepted Answer

Not null constraint

Answer

Unique constraint

Answer

Check constraint

Answer

Default constraint

Question 48

What happens if a referential integrity constraint is violated during a data insertion attempt?

Accepted Answer

The insertion operation fails, preventing data inconsistency.

Answer

The database automatically updates the related table to maintain consistency.

Answer

The data is inserted, but a warning message is displayed.

Answer

The data is inserted with a default value.

Question 49

In a database system, why is it important to enforce data integrity?

Accepted Answer

To ensure data accuracy, consistency, and reliability.

Answer

To prevent unauthorized access to the database.

Answer

To reduce the storage space required for the database.

Answer

To improve the performance of database queries.

Question 50

Which of the following is an example of a business rule that can be implemented as a data integrity constraint?

Accepted Answer

A customer's credit limit cannot exceed $10,000.

Answer

The database should be backed up daily.

Answer

Users should only be able to access data relevant to their roles.

Answer

The database should be optimized for performance.